Hm. If you're talking about these two lines:
if (!bExceptionDebugging)
return;
In src/gui-win/opencon.c, that's just a Windows specific bug that
should be fixed by somebody who actually uses Hatari on Windows.

Nicolas, was your issue with exception debugging about this Windows
specific bug?

No, I think it mixed 2 things that were not related, so you can forget
what I wrote about -D option :)

So, how it should be fixed? :-)

I thought '-D' had other effect than just enabling going to debugger
when an exception happened. As it's not the case, the way '-D' works is
OK with me.